Convert Bsurface (without object) to mesh
Found my answer in this comunity and blenderartist.The problem was that i needed to click on the little arrow (selection off/on) next to the object.
Wasn't aware of that. 
Thanks, lluis
i leave here the posts:
https://blenderartists.org/forum/showthread.php?441827-Bsurface-without-object&amp;p=3263344&amp;highlight=#post3263344
https://blenderartists.org/forum/showthread.php?441827-Bsurface-without-object&amp;p=3263344&amp;highlight=#post3263344